-/* $Id$ */
+/*
+ * This file is part of libFirm.
+ * Copyright (C) 2012 University of Karlsruhe.
+ */
-#ifdef HAVE_CONFIG_H
-# include "config.h"
-#endif
+/**
+ * @file
+ * @brief Scheduling utilities for nodes in Blocks and Blocks.
+ * @author Sebastian Hack
+ */
+#include "config.h"
-#ifdef HAVE_STDLIB_H
-# include <stdlib.h>
-#endif
+#include <stdlib.h>
-#include "impl.h"
-#include "irprintf.h"
-#include "irgwalk.h"
#include "firm_types.h"
-#include "irgraph_t.h"
#include "iredges_t.h"
#include "ircons.h"
-#include "irextbb.h"
+#include "irgmod.h"
#include "debug.h"
#include "bemodule.h"
#include "bearch.h"
-#include "besched_t.h"
+#include "besched.h"
#include "beutil.h"
#include "belistsched.h"
+#include "belive.h"
-FIRM_IMPL1(sched_get_time_step, int, const ir_node *)
-FIRM_IMPL1(sched_has_next, int, const ir_node *)
-FIRM_IMPL1(sched_has_prev, int, const ir_node *)
-FIRM_IMPL1(sched_next, ir_node *, const ir_node *)
-FIRM_IMPL1(sched_prev, ir_node *, const ir_node *)
-FIRM_IMPL1(sched_first, ir_node *, const ir_node *)
-FIRM_IMPL1(sched_last, ir_node *, const ir_node *)
-FIRM_IMPL2(sched_add_after, ir_node *, ir_node *, ir_node *)
-FIRM_IMPL2(sched_add_before, ir_node *, ir_node *, ir_node *)
-FIRM_IMPL1_VOID(sched_init_block, ir_node *)
-FIRM_IMPL1_VOID(sched_reset, ir_node *)
-FIRM_IMPL2(sched_comes_after, int, const ir_node *, const ir_node *)
-FIRM_IMPL1_VOID(sched_remove, ir_node *)
-
-size_t sched_irn_data_offset = 0;
-
-static void block_sched_dumper(ir_node *block, void *env)
-{
- FILE *f = env;
- const ir_node *curr;
-
- ir_fprintf(f, "%+F:\n", block);
-
- sched_foreach(block, curr) {
- sched_info_t *info = get_irn_sched_info(curr);
- ir_fprintf(f, "\t%6d: %+F\n", info->time_step, curr);
- }
-}
-
-void be_sched_dump(FILE *f, ir_graph *irg)
-{
- irg_block_walk_graph(irg, block_sched_dumper, NULL, f);
-}
-
-/* Init the scheduling stuff. */
-void be_init_sched(void)
-{
- sched_irn_data_offset = register_additional_node_data(sizeof(sched_info_t));
-}
+#include "lc_opts.h"
+#include "lc_opts_enum.h"
+#include "irtools.h"
-BE_REGISTER_MODULE_CONSTRUCTOR(be_init_sched);
+#define SCHED_INITIAL_GRANULARITY (1 << 14)
-void sched_renumber(const ir_node *block)
+static void sched_renumber(ir_node *const block)
{
- ir_node *irn;
sched_info_t *inf;
sched_timestep_t step = SCHED_INITIAL_GRANULARITY;
}
}
-/* Verify a schedule. */
-int sched_verify(const ir_node *block)
+static inline void sched_set_time_stamp(const ir_node *irn)
{
- int res = 1;
- const ir_node *irn;
- int i, n;
- int *save_time_step;
- const ir_node **save_nodes;
- const ir_edge_t *edge;
- pset *scheduled_nodes = pset_new_ptr_default();
- FIRM_DBG_REGISTER(firm_dbg_module_t *dbg_sched, "firm.be.sched");
-
- /* Count the number of nodes in the schedule. */
- n = 0;
- sched_foreach(block, irn)
- n++;
-
- if(n <= 0)
- return 1;
-
- save_time_step = xmalloc(n * sizeof(save_time_step[0]));
- save_nodes = xmalloc(n * sizeof(save_nodes[0]));
-
- i = 0;
- sched_foreach(block, irn) {
- sched_info_t *info = get_irn_sched_info(irn);
- save_time_step[i] = info->time_step;
- save_nodes[i] = (ir_node *)irn;
- info->time_step = i;
- pset_insert_ptr(scheduled_nodes, irn);
-
- i += 1;
- }
+ sched_info_t *info = get_irn_sched_info(irn);
+ const sched_info_t *prev_info = get_irn_sched_info(info->prev);
+ const sched_info_t *next_info = get_irn_sched_info(info->next);
+ sched_timestep_t before_ts = prev_info->time_step;
+ sched_timestep_t after_ts = next_info->time_step;
/*
- * Check if each relevant operand of a node is scheduled before
- * the node itself.
+ * If we are the last, we can give us a big time step,
+ * else we have to compute our time step from our
+ * neighbours.
*/
- sched_foreach(block, irn) {
- int i, n;
- int step = sched_get_time_step(irn);
-
- for(i = 0, n = get_irn_arity(irn); i < n; i++) {
- ir_node *op = get_irn_n(irn, i);
-
- if(to_appear_in_schedule(op)
- && !is_Phi(irn)
- && get_nodes_block(op) == block
- && sched_get_time_step(op) > step) {
-
- DBG((dbg_sched, LEVEL_DEFAULT,
- "%+F: %+F is operand of %+F but scheduled after\n", block, op, irn));
- res = 0;
- }
+ if(before_ts >= after_ts) {
+ info->time_step = before_ts + SCHED_INITIAL_GRANULARITY;
+ /* overflow? */
+ if (info->time_step <= before_ts) {
+ sched_renumber(get_nodes_block(irn));
}
+ } else {
+ sched_timestep_t ts = (before_ts + after_ts) / 2;
+
+ /*
+ * If the resolution went out, we have to renumber
+ * this block.
+ */
+ if(ts == before_ts || ts == after_ts)
+ sched_renumber(get_nodes_block(irn));
+ else
+ info->time_step = ts;
}
-
- /* Check, if the time steps are correct */
- for(i = 1; i < n; ++i) {
- if(save_time_step[i] - save_time_step[i - 1] <= 0) {
- DBG((dbg_sched, LEVEL_DEFAULT,
- "%+F from %+F(%d) -> %+F(%d) step shrinks from %d -> %d\n",
- block, save_nodes[i - 1], i - 1, save_nodes[i], i,
- save_time_step[i - 1], save_time_step[i]));
- res = 0;
- }
- }
-
- /* Restore the old time steps */
- i = 0;
- sched_foreach(block, irn) {
- sched_info_t *info = get_irn_sched_info(irn);
- info->time_step = save_time_step[i++];
- }
-
- /* Check for all nodes in the block if they are scheduled. */
- foreach_out_edge(block, edge) {
- ir_node *irn = get_edge_src_irn(edge);
- if(to_appear_in_schedule(irn) && !pset_find_ptr(scheduled_nodes, irn)) {
- DBG((dbg_sched, LEVEL_DEFAULT,
- "%+F: %+F is in block but not scheduled\n", block, irn));
- res = 0;
- }
- }
-
- del_pset(scheduled_nodes);
- free(save_time_step);
- free((void *) save_nodes);
- return res;
}
-/**
- * Block-Walker: verify the current block and update the status
- */
-static void sched_verify_walker(ir_node *block, void *data)
+void sched_add_before(ir_node *before, ir_node *irn)
{
- int *res = data;
- *res &= sched_verify(block);
+ sched_info_t *info = get_irn_sched_info(irn);
+ ir_node *next = before;
+ sched_info_t *next_info = get_irn_sched_info(next);
+ ir_node *prev = next_info->prev;
+ sched_info_t *prev_info = get_irn_sched_info(prev);
+ assert(sched_is_scheduled(before));
+ assert(!sched_is_scheduled(irn));
+ assert(!is_Proj(before));
+ assert(!is_Proj(irn));
+
+ info->prev = prev;
+ info->next = next;
+ prev_info->next = irn;
+ next_info->prev = irn;
+ sched_set_time_stamp(irn);
}
-/* Verify the schedules in all blocks of the irg. */
-int sched_verify_irg(ir_graph *irg)
+void sched_add_after(ir_node *after, ir_node *irn)
{
- int res = 1;
- irg_block_walk_graph(irg, sched_verify_walker, NULL, &res);
-
- return res;
+ sched_info_t *info = get_irn_sched_info(irn);
+ ir_node *prev = after;
+ sched_info_t *prev_info = get_irn_sched_info(prev);
+ ir_node *next = prev_info->next;
+ sched_info_t *next_info = get_irn_sched_info(next);
+ assert(sched_is_scheduled(after));
+ assert(!sched_is_scheduled(irn));
+ assert(!is_Proj(after));
+ assert(!is_Proj(irn));
+
+ info->prev = prev;
+ info->next = next;
+ prev_info->next = irn;
+ next_info->prev = irn;
+ sched_set_time_stamp(irn);
}
-int sched_skip_cf_predicator(const ir_node *irn, void *data) {
- arch_env_t *ae = data;
- return arch_irn_class_is(ae, irn, branch);
-}
-
-int sched_skip_phi_predicator(const ir_node *irn, void *data) {
- return is_Phi(irn);
+void sched_remove(ir_node *irn)
+{
+ sched_info_t *info = get_irn_sched_info(irn);
+ ir_node *prev = info->prev;
+ ir_node *next = info->next;
+ sched_info_t *prev_info = get_irn_sched_info(prev);
+ sched_info_t *next_info = get_irn_sched_info(next);
+ assert(sched_is_scheduled(irn));
+
+ prev_info->next = next;
+ next_info->prev = prev;
+ info->next = NULL;
+ info->prev = NULL;
}
-/* Skip nodes in a schedule. */
-ir_node *sched_skip(ir_node *from, int forward, sched_predicator_t *predicator, void *data)
+void sched_replace(ir_node *const old, ir_node *const irn)
{
- const ir_node *bl = get_block(from);
- ir_node *curr;
+ assert(sched_is_scheduled(old));
+ assert(!sched_is_scheduled(irn));
- if (is_Block(from))
- from = forward ? sched_next(from) : sched_prev(from);
+ sched_info_t *const old_info = get_irn_sched_info(old);
+ sched_info_t *const irn_info = get_irn_sched_info(irn);
+ *irn_info = *old_info;
- for(curr = from; curr != bl && predicator(curr, data); curr = forward ? sched_next(curr) : sched_prev(curr));
+ old_info->prev = NULL;
+ old_info->next = NULL;
- return curr;
+ ir_node *const prev = irn_info->prev;
+ ir_node *const next = irn_info->next;
+ get_irn_sched_info(prev)->next = irn;
+ get_irn_sched_info(next)->prev = irn;
}
-//---------------------------------------------------------------------------
+static be_module_list_entry_t *schedulers;
+static schedule_func scheduler;
-typedef struct remove_dead_nodes_env_t_ {
- ir_graph *irg;
- bitset_t *reachable;
-} remove_dead_nodes_env_t;
-
-static void mark_dead_nodes_walker(ir_node *node, void *data)
+void be_register_scheduler(const char *name, schedule_func func)
{
- remove_dead_nodes_env_t *env = (remove_dead_nodes_env_t*) data;
- bitset_set(env->reachable, get_irn_idx(node));
+ if (scheduler == NULL)
+ scheduler = func;
+ be_add_module_to_list(&schedulers, name, (void*)func);
}
-static void remove_dead_nodes_walker(ir_node *block, void *data)
+void be_schedule_graph(ir_graph *irg)
{
- remove_dead_nodes_env_t *env = (remove_dead_nodes_env_t*) data;
- ir_node *node, *next;
-
- for (node = sched_first(block); ! sched_is_end(node); node = next) {
- int i;
-
- /* get next node now, as after calling sched_remove it will be invalid */
- next = sched_next(node);
-
- if (bitset_is_set(env->reachable, get_irn_idx(node)))
- continue;
-
- sched_remove(node);
-
- /* when a node is exchanged, it is turned into Bad, do not set ins for those */
- if (is_Bad(node))
- continue;
-
- for (i = get_irn_arity(node) - 1; i >= 0; --i)
- set_irn_n(node, i, new_r_Bad(env->irg));
- }
+ scheduler(irg);
}
-void be_remove_dead_nodes_from_schedule(ir_graph *irg)
+BE_REGISTER_MODULE_CONSTRUCTOR(be_init_sched)
+void be_init_sched(void)
{
- remove_dead_nodes_env_t env;
- env.irg = irg;
- env.reachable = bitset_alloca(get_irg_last_idx(irg));
-
- // mark all reachable nodes
- irg_walk_graph(irg, mark_dead_nodes_walker, NULL, &env);
-
- // walk schedule and remove non-marked nodes
- irg_block_walk_graph(irg, remove_dead_nodes_walker, NULL, &env);
+ lc_opt_entry_t *be_grp = lc_opt_get_grp(firm_opt_get_root(), "be");
+ be_add_module_list_opt(be_grp, "scheduler", "scheduling algorithm",
+ &schedulers, (void**)&scheduler);
}
projects / libfirm / blobdiff